<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- 准备好一个"容器" -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom,用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel,用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        //1.创建组件
        class Login extends React.Component {
            handleSubmit = (event) => {
                event.preventDefault();//阻止表单提交
                const { username, password } = this;
                alert(`你输入的用户名是:${username.value},你输入的密码是:${password.value}`)
            }
            render() {
                return (
                    <form onSubmit={this.handleSubmit}>
                        用户名: <input ref={c => this.username = c} type="text" name="username" />
                        密码: <input ref={c => this.password = c} type="password" name="password" />
                        <button>登录</button>
                    </form>
                )
            }
        }

        //2.渲染虚拟DOM到页面
        ReactDOM.render(<Login />, document.getElementById('test'))

    </script>



</body>

</html>